The Engine Control Module, or ECM, directly controls the engine. Still, it can’t do that properly without the Transmission Control Module or TCM and PCM, which work together and exchange information.

The powertrain control module (PCM) in your Jeep Wrangler acts as your engine's brain. Here's where it can cause problems, and how to fix them.

GM has issued a recall for certain examples of the 2015 to 2017 model-year Chevy City Express utility van over an issue related to the engine control module.